(as|) dumb as a coal bucket
1
extremely unintelligent or lacking in common sense
The exact origin of the phrase "dumb as a coal bucket" is unclear. It is likely a variation or adaptation of the more commonly known phrase "dumb as a box of rocks," which has been in use since at least the mid-20th century. Both phrases share the same meaning, implying a lack of intelligence or mental acuity. This phrase is primarily used in informal or colloquial contexts and is not considered a widely recognized idiom.
- Don't bother asking her for help with math.She's about as dumb as a coal bucket when it comes to numbers.
- He couldn't figure out how to operate the simplest machinery.Honestly, he's as dumb as a coal bucket.
- I tried explaining the concept to him, but he just stared at me blankly.He's as dumb as a coal bucket.